%
(Program to mill a flowsnake)
(K. Lerman)

o<flowsnake> sub
#<level> = #1
#<startX> = #2
#<startY> = #3
#<endX> = #4
#<endY> = #5

  o<test> if [#<level> EQ 0]
    g1 f10 x#<endX> y#<endY>
  o<test> else
    #<p1X> = [[#<startX> * 2 + #<endX>]/3]
    #<p1Y> = [[#<startY> * 2 + #<endY>]/3]

    #<p2X> = [[#<startX> + #<endX>]/2 + [#<endY> - #<startY>]/[SQRT[12.0]]]
    #<p2Y> = [[#<startY> + #<endY>]/2 - [#<endX> - #<startX>]/[SQRT[12.0]]]

    #<p3X> = [[#<startX> + 2 * #<endX>]/3]
    #<p3Y> = [[#<startY> + 2 * #<endY>]/3]

    o<flowsnake> call [#<level>-1] [#<startX>] [#<startY>] [#<p1X>] [#<p1Y>]
    o<flowsnake> call [#<level>-1] [#<p1X>] [#<p1Y>] [#<p2X>] [#<p2Y>]
    o<flowsnake> call [#<level>-1] [#<p2X>] [#<p2Y>] [#<p3X>] [#<p3Y>]
    o<flowsnake> call [#<level>-1] [#<p3X>] [#<p3Y>] [#<endX>] [#<endY>]
  o<test> endif
o<flowsnake> endsub

S1M3
g0 z1
g0 x.25 y1.0
g1 f10 z0
#<level> = 3
o<flowsnake> call [#<level>] [.25] (will this comment cause problems) [1.0] [3.75] [1.0]
o<flowsnake> call [#<level>] [3.75] [1.0] [2.0] [3.95]
o<flowsnake> call [#<level>] [2.0] [3.95] [.25] [1.0]
g0 z1
M5
%